#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int main()
{
    pid_t id = fork();
    if(id ==0 )
    {
        while(1)
        {
        printf("这是子进程,pid = %d ,ppid = %d\n",getpid(),getppid());
        sleep(1);
        }
    }
    else 
    {
        while(1)
        {
        printf("这是父进程,pid = %d ,ppid = %d\n",getpid(),getppid());
        sleep(3);
        }
    }
    return 0;
}
